I voted for Lois' powers would eventually fade.. in time.
After all she's not of a Kryptonian descent so Clark's powers (probbly) can't inhabit her human body for a long time.
Clark though is Kryptonian and I didn't actually believe that he's drained out all his powers. Maybe there's powers left in his genes(?) so in time too it would return and learn them back like the way when he was just learning his abilities when he was younger.
